He said: "We put doors with badge readers, there were cameras, I think, to get to some of our labs, you had to badge in four times to get there.”

Forestall told Merchant that there were even posters reminding employees to keep the project secret: “[Jobs] put up a sign that said ‘Fight Club’ because the first rule of Fight Club in the movie is that you don’t talk about Fight Club[.]”

Jobs was notorious for his hot temper and unconventional business tactics. He has famously fired employees in public and without notice.

The book also reveals that Jobs was one of the biggest roadblocks to the success of the iPod and creation of the iPhone, despite their prominent roles in cementing Jobs’ legacy.